refactor: change file offset bitwidths in android

This patch updates the exposed file offset bindings to Android targets.
At present, all target triples provide LFS64 types and routines, even
though it is only on platforms with a 32-bit ABI that this is required.

The Android upstream documentation mentions that these symbols are not
really necessary in platforms with a 64-bit ABI [1]. We currently also
expose those.

Following the trend towards providing a single, 64-bit unsuffixed symbol
in the `libc` crate, this patch deprecates all such symbols. The
deprecation note advises use of the memory-wise equivalent, unsuffixed
types.

[1]: https://android.googlesource.com/platform/bionic/+/main/docs/32-bit-abi.md

Author: dybucc

src/unix/linux_like/android/b64/aarch64/mod.rs

@@ -1,4 +1,3 @@
-use crate::off64_t;
 use crate::prelude::*;
 
 pub type wchar_t = u32;
@@ -15,7 +14,7 @@ s! {
         pub st_gid: crate::gid_t,
         pub st_rdev: crate::dev_t,
         __pad1: Padding<c_ulong>,
-        pub st_size: off64_t,
+        pub st_size: crate::off_t,
         pub st_blksize: c_int,
         __pad2: Padding<c_int>,
         pub st_blocks: c_long,
@@ -29,6 +28,12 @@ s! {
         __unused5: Padding<c_uint>,
     }
 
+    #[deprecated(
+        since = "0.2.187",
+        note = "Use `stat` instead. Under 64-bit ABIs, Android aliases these types, and the `libc` \
+                crate is phasing out support for suffixed types in favor of a single, fixed-width unsuffixed type."
+    )]
+    #[allow(deprecated)]
     pub struct stat64 {
         pub st_dev: crate::dev_t,
         pub st_ino: crate::ino_t,
@@ -38,7 +43,7 @@ s! {
         pub st_gid: crate::gid_t,
         pub st_rdev: crate::dev_t,
         __pad1: Padding<c_ulong>,
-        pub st_size: off64_t,
+        pub st_size: crate::off64_t,
         pub st_blksize: c_int,
         __pad2: Padding<c_int>,
         pub st_blocks: c_long,

src/unix/linux_like/android/b64/mod.rs

@@ -4,9 +4,16 @@ use crate::prelude::*;
 // but may be wrong for mips64
 
 pub type mode_t = u32;
-pub type off64_t = i64;
 pub type socklen_t = u32;
 
+#[deprecated(
+    since = "0.2.187",
+    note = "Use `off_t` instead. Under 64-bit ABIs, Android just aliases these two types, and the \
+            `libc` crate is phasing out support for suffixed types in favor of exposing a single, \
+            fixed-width unsuffixed type."
+)]
+pub type off64_t = i64;
+
 s! {
     pub struct sigset_t {
         __val: [c_ulong; 1],
@@ -21,6 +28,12 @@ s! {
         pub sa_restorer: Option<extern "C" fn()>,
     }
 
+    #[deprecated(
+        since = "0.2.187",
+        note = "Use `rlimit` instead. Under 64-bit ABIs, Android aliases these types, and the \
+                `libc` crate is phasing out support for suffixed variants in favor of a single, \
+                fixed-width suffixed type."
+    )]
     pub struct rlimit64 {
         pub rlim_cur: c_ulonglong,
         pub rlim_max: c_ulonglong,
@@ -78,6 +91,12 @@ s! {
         pub _f: [c_char; 0],
     }
 
+    #[deprecated(
+        since = "0.2.187",
+        note = "Use `statfs` instead. Under 64-bit ABIs, Android aliases these types, and the \
+               `libc` crate is phasing out support for suffixed types in favor of a single \
+               unsuffixed type with a fixed bit width."
+    )]
     pub struct statfs64 {
         pub f_type: u64,
         pub f_bsize: u64,
@@ -93,6 +112,12 @@ s! {
         pub f_spare: [u64; 4],
     }
 
+    #[deprecated(
+        since = "0.2.187",
+        note = "Use `statfs` instead. Under 64-bit ABIs, Android aliases these types, and the \
+               `libc` crate is phasing out support for suffixed types in favor of a single \
+               unsuffixed type with a fixed bit width."
+    )]
     pub struct statvfs64 {
         pub f_bsize: c_ulong,
         pub f_frsize: c_ulong,
@@ -135,6 +160,12 @@ s! {
         __reserved: Padding<[c_char; 36]>,
     }
 
+    #[deprecated(
+        since = "0.2.187",
+        note = "Use `sigset_t` instead. Under 64-bit ABIs, Android aliases these types, and the \
+                `libc` crate is phasing out support for suffixed variants in favor of a single, \
+                unsuffixed type with a fixed bit width."
+    )]
     pub struct sigset64_t {
         __bits: [c_ulong; 1],
     }

src/unix/linux_like/android/b64/riscv64/mod.rs

@@ -1,4 +1,3 @@
-use crate::off64_t;
 use crate::prelude::*;
 
 pub type wchar_t = u32;
@@ -16,7 +15,7 @@ s! {
         pub st_gid: crate::gid_t,
         pub st_rdev: crate::dev_t,
         __pad1: Padding<c_ulong>,
-        pub st_size: off64_t,
+        pub st_size: crate::off_t,
         pub st_blksize: c_int,
         __pad2: Padding<c_int>,
         pub st_blocks: c_long,
@@ -30,6 +29,13 @@ s! {
         __unused5: Padding<c_uint>,
     }
 
+    #[deprecated(
+        since = "0.2.187",
+        note = "Use `stat` instead. Under 64-bit ABIs, Android aliases these types, and the `libc` \
+                crate is phasing out support for suffixed types in favor of a single unsuffixed \
+                type with a fixed bit width."
+    )]
+    #[allow(deprecated)]
     pub struct stat64 {
         pub st_dev: crate::dev_t,
         pub st_ino: crate::ino_t,
@@ -39,7 +45,7 @@ s! {
         pub st_gid: crate::gid_t,
         pub st_rdev: crate::dev_t,
         __pad1: Padding<c_ulong>,
-        pub st_size: off64_t,
+        pub st_size: crate::off64_t,
         pub st_blksize: c_int,
         __pad2: Padding<c_int>,
         pub st_blocks: c_long,

src/unix/linux_like/android/b64/x86_64/mod.rs

@@ -1,4 +1,3 @@
-use crate::off64_t;
 use crate::prelude::*;
 
 pub type wchar_t = i32;
@@ -15,7 +14,7 @@ s! {
         pub st_uid: crate::uid_t,
         pub st_gid: crate::gid_t,
         pub st_rdev: crate::dev_t,
-        pub st_size: off64_t,
+        pub st_size: crate::off_t,
         pub st_blksize: c_long,
         pub st_blocks: c_long,
         pub st_atime: c_long,
@@ -27,6 +26,13 @@ s! {
         __unused: Padding<[c_long; 3]>,
     }
 
+    #[deprecated(
+        since = "0.2.187",
+        note = "Use `stat` instead. Under 64-bit ABIs, Android aliases these types, and the `libc` \
+                crate is phasing out support for suffixed types in favor of a single, unsuffixed, \
+                fixed-width type."
+    )]
+    #[allow(deprecated)]
     pub struct stat64 {
         pub st_dev: crate::dev_t,
         pub st_ino: crate::ino_t,
@@ -35,7 +41,7 @@ s! {
         pub st_uid: crate::uid_t,
         pub st_gid: crate::gid_t,
         pub st_rdev: crate::dev_t,
-        pub st_size: off64_t,
+        pub st_size: crate::off64_t,
         pub st_blksize: c_long,
         pub st_blocks: c_long,
         pub st_atime: c_long,
@@ -156,6 +162,7 @@ s! {
 }
 
 s_no_extra_traits! {
+    #[allow(deprecated)]
     pub union __c_anonymous_uc_sigmask {
         uc_sigmask: crate::sigset_t,
         uc_sigmask64: crate::sigset64_t,

src/unix/linux_like/android/mod.rs

@@ -34,7 +34,6 @@ pub type nfds_t = c_uint;
 pub type rlim_t = c_ulong;
 pub type dev_t = c_ulong;
 pub type ino_t = c_ulong;
-pub type ino64_t = u64;
 pub type __CPU_BITTYPE = c_ulong;
 pub type idtype_t = c_int;
 pub type loff_t = c_longlong;
@@ -48,6 +47,17 @@ pub type __u32 = c_uint;
 pub type __s32 = c_int;
 pub type __be16 = __u16;
 
+#[cfg_attr(
+    target_pointer_width = "64",
+    deprecated(
+        since = "0.2.187",
+        note = "Use `ino_t` instead. Under 64-bit ABIs, Android aliases these types and the `libc` \
+                crate is phasing out support for suffixed variants in favor of a single, \
+                fixed-width unsuffixed type."
+    )
+)]
+pub type ino64_t = u64;
+
 // linux/elf.h
 
 pub type Elf32_Addr = u32;
@@ -119,6 +129,15 @@ s! {
         pub l_pid: crate::pid_t,
     }
 
+    #[cfg_attr(
+        target_pointer_width = "64",
+        deprecated(
+            since = "0.2.187",
+            note = "Use `flock` instead. Under 64-bit ABIs, Android aliases these types, and the \
+                    `libc` crate is phasing out support for suffixed variants in favor of a single, \
+                    unsuffixed, fixed-width symbol."
+        )
+    )]
     pub struct flock64 {
         pub l_type: c_short,
         pub l_whence: c_short,
@@ -511,6 +530,12 @@ s! {
         pub d_name: [c_char; 256],
     }
 
+    #[deprecated(
+        since = "0.2.187",
+        note = "Use `dirent` instead. This type is defined as an alias to it and the `libc` crate \
+                is phasing out support for suffixed types in favor of a single, fixed-width \
+                unsuffixed type."
+    )]
     pub struct dirent64 {
         pub d_ino: u64,
         pub d_off: i64,
@@ -3385,7 +3410,27 @@ extern "C" {
     pub fn setgrent();
     pub fn endgrent();
     pub fn getgrent() -> *mut crate::group;
+    #[cfg_attr(
+        target_pointer_width = "64",
+        deprecated(
+            since = "0.2.187",
+            note = "Use `getrlimit` instead. Under 64-bit ABIs, Android aliases these types and the \
+                    `libc` crate is phasing out support for suffixed variants in favor of a single, \
+                    fixed-width, unsuffixed type."
+        ),
+        allow(deprecated)
+    )]
     pub fn getrlimit64(resource: c_int, rlim: *mut rlimit64) -> c_int;
+    #[cfg_attr(
+        target_pointer_width = "64",
+        deprecated(
+            since = "0.2.187",
+            note = "Use `setrlimit` instead. Under 64-bit ABIs, Android aliases these types and the \
+                    `libc` crate is phasing out support for suffixed variants in favor of a single, \
+                    fixed-width, unsuffixed type."
+        ),
+        allow(deprecated)
+    )]
     pub fn setrlimit64(resource: c_int, rlim: *const rlimit64) -> c_int;
     pub fn getrlimit(resource: c_int, rlim: *mut crate::rlimit) -> c_int;
     pub fn setrlimit(resource: c_int, rlim: *const crate::rlimit) -> c_int;
@@ -3395,6 +3440,16 @@ extern "C" {
         new_limit: *const crate::rlimit,
         old_limit: *mut crate::rlimit,
     ) -> c_int;
+    #[cfg_attr(
+        target_pointer_width = "64",
+        deprecated(
+            since = "0.2.187",
+            note = "Use `prlimit` instead. Under 64-bit ABIs, Android aliases these types and the \
+                    `libc` crate is phasing out support for suffixed variants in favor of a single, \
+                    fixed-width, unsuffixed type."
+        ),
+        allow(deprecated)
+    )]
     pub fn prlimit64(
         pid: crate::pid_t,
         resource: c_int,
@@ -3455,8 +3510,28 @@ extern "C" {
     pub fn seekdir(dirp: *mut crate::DIR, loc: c_long);
     pub fn telldir(dirp: *mut crate::DIR) -> c_long;
     pub fn fallocate(fd: c_int, mode: c_int, offset: off_t, len: off_t) -> c_int;
+    #[cfg_attr(
+        target_pointer_width = "64",
+        deprecated(
+            since = "0.2.187",
+            note = "Use `fallocate` instead. Under 64-bit ABIs, Android aliases these types and \
+                    the `libc` crate is phasing out support for suffixed variants in favor of a \
+                    fixed-width unsuffixed type."
+        ),
+        allow(deprecated)
+    )]
     pub fn fallocate64(fd: c_int, mode: c_int, offset: off64_t, len: off64_t) -> c_int;
     pub fn posix_fallocate(fd: c_int, offset: off_t, len: off_t) -> c_int;
+    #[cfg_attr(
+        target_pointer_width = "64",
+        deprecated(
+            since = "0.2.187",
+            note = "Use `posix_fallocate` instead. Under 64-bit ABIs, Android aliases these types \
+                    and the `libc` crate is phasing out support for suffixed variants in favor of \
+                    a fixed-width unsuffixed type."
+        ),
+        allow(deprecated)
+    )]
     pub fn posix_fallocate64(fd: c_int, offset: off64_t, len: off64_t) -> c_int;
     pub fn getxattr(
         path: *const c_char,
@@ -3613,6 +3688,16 @@ extern "C" {
         param: *const crate::sched_param,
     ) -> c_int;
     pub fn sendfile(out_fd: c_int, in_fd: c_int, offset: *mut off_t, count: size_t) -> ssize_t;
+    #[cfg_attr(
+        target_pointer_width = "64",
+        deprecated(
+            since = "0.2.187",
+            note = "Use `sendfile` instead. Under 64-bit ABIs, Android aliases these types and the \
+                    `libc` crate is phasing out support for suffixed variants in favor of a single \
+                    unsuffixed type with a fixed bit-width."
+        ),
+        allow(deprecated)
+    )]
     pub fn sendfile64(out_fd: c_int, in_fd: c_int, offset: *mut off64_t, count: size_t) -> ssize_t;
     pub fn setfsgid(gid: crate::gid_t) -> c_int;
     pub fn setfsuid(uid: crate::uid_t) -> c_int;